DUAN Ni-na,TAN Xue-jun,ZHANG Chen.Analysis of Sewage Sludge Mono-incineration Thermodynamic Calculation Method in a Sewage Treatment Plant[J].China Water & Wastewater,2021,37(16 16):83-88.
Analysis of Sewage Sludge Mono-incineration Thermodynamic Calculation Method in a Sewage Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
16 16
Page:
83-88
Column:
Date of publication:
2021-08-17
- Abstract:
- Sludge incineration, as one of the main sludge treatment technologies in urban sewage treatment plants, has been widely applied in engineering in China. At present, coal-fired boiler thermodynamic calculation method is often referred to calculate the key parameters (such as calorific value of sludge or fuel, composition of flue gas and enthalpy value) in the process of design and simulation. Thermal calculation is the basis of process design and simulation. As an important part of process design, modification and improvement of the method is beneficial to improve the accuracy and rationality of process design and management. There are differences in the incineration process and management between sewage sludge and coal incineration in coal-fired boilers. The calculation method of coal-fired boilers ignores the latent heat of water vapor in flue gas, so the accuracy of coal-fired boiler thermal calculation method needs to be verified. A comparison between the traditional thermal calculation method and the optimized thermal calculation method was exemplified. The actual state and latent heat of water vapor in flue gas were not considered when the coal-fired boiler thermal calculation method was used for sludge incineration process calculation, which affected the temperature prediction accuracy of incinerator combustion, flue gas waste heat utilization and flue gas purification. Common range of sludge water content to be combusted in the furnace in China is 50%-60%. The combustion temperature and the corresponding inlet and outlet temperature of flue gas facilities were 40-50 ℃ higher when the traditional method was employed. When the traditional method is used for design and operation, the deviation caused by calculation should be fully considered in combination with the selection of sludge water content to be combusted in the furnace.
Last Update:
2021-08-17